One Way Air Flow Valve

The Cape Backdraft Damper is the ultimate one way air flow valve, designed to overcome the inefficiencies and limitations of traditional gravity or butterfly dampers.  

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The Cape Damper consists of a specially formulated fabric sleeve attached to an outer metal sleeve.  The fabric sleeve will allow air to pass through in the desired direction of flow with miniscule reduction in airflow (fig 1).  For reverse airflow, airflow that should be stopped by a backdraft damper, the Cape Damper gives a better seal at a lower pressure and holds that seal as the pressure increases (fig 2). The Cape Damper is quiet, with no metal clanging sounds, and can be installed in a horizontal or vertical orientation. It is available in a variety of sizes from 4" to 8" in diameter.

Test Results

ASTM E 84 Surface Burning Characteristics Of Building Materials

We tested our damper against two others at a moderate airflow, the kind of airflow you will see in a residential application.  First we ran the fan through plain duct to set our desired airflow.  Then we inserted each type of damper into the same duct and measured the airflow.

The other dampers decrease system efficiency by adding static pressure in the direction of desired airflow.

For reverse airflow, we used the same test.  Because all of these dampers are reasonably effective at stopping air, we compared leakage rates at various pressures.

Diagram

◄Please click on image for a large view of the diagram.

For more information, a product brochure, or technical and pricing assistance, please contact us at 800-222-5932 or E-mail us at: sales@tamtech.com

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